<template>
    <div>
      <!--      面包屑导航区域-->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
      </el-breadcrumb>
<!--      卡片视图区域-->
      <el-card>
<!--        警告区域-->
        <el-alert
          title="注意！只允许为第三级分类设置参数"
          type="warning"
          show-icon>
        </el-alert>
<!--        选择商品分类-->
        <el-row class="cate_opt">
          <el-col>
            <span>请选择商品分类:</span>
<!--            选择商品分类的联级选择框-->
            <el-cascader
              v-model="selectedKeys"
              :options="cateList"
              :props="cateProps"
              @change="handleChange">

            </el-cascader>
          </el-col>
        </el-row>

<!--        tab页签区域-->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
<!--          这是动态参数面板-->
          <el-tab-pane label="动态参数" name="many">
            <el-button size="mini" type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
<!--            这是动态参数表格-->
            <el-table :data="manyTableData" stripe border>
<!--              展开行-->
              <el-table-column type="expand">
                <template slot-scope="scope">
<!--                  便利的每一项-->
                  <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handelClosed(i,scope.row)">{{item}}</el-tag>
<!--                  new tag的文本框-->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
<!--                  new的按钮-->
                  <el-button v-else size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
<!--              索引列-->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                  <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
<!--          这是静态属性面板-->
          <el-tab-pane label="静态属性" name="only">
            <el-button size="mini" type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
            <!--            这是静态属性表格-->
            <el-table :data="onlyTableData" stripe border>
              <!--              展开行-->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!--                  便利的每一项-->
                  <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handelClosed(i,scope.row)">{{item}}</el-tag>
                  <!--                  new tag的文本框-->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <!--                  new的按钮-->
                  <el-button v-else size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <!--              索引列-->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="属性名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                  <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
        </el-tabs>

      </el-card>

<!--      显示添加参数的对话框-->
      <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed">
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" >
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
      </el-dialog>

<!--      显示修改参数的对话框-->
      <el-dialog
        :title="'修改'+titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed">
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
      </el-dialog>
    </div>
</template>

<script>
  export default {
    name: 'params',
    data(){
      return {
        //商品分类列表
        cateList:[],
        //级联选择框选中数据的id的数组
        selectedKeys:[],
        //级联选择框的配置
        cateProps:{
          expandTrigger: 'hover',
          value:'cat_id',
          label:'cat_name',
          children:'children'
        },
        //页签当前激活的名称
        activeName:'many',
        //动态参数数据
        manyTableData:[],
        //静态属性数据
        onlyTableData:[],
        //添加参数对话框的显示与隐藏
        addDialogVisible:false,
        //表单的数据对象
        addForm:{
          attr_name:''
        },
        //表单的规则验证对象
        addFormRules:{
          attr_name:[
            { required: true, message: '请输入参数', trigger: 'blur' },
          ]
        },
        //修改参数对话框的显示与隐藏
        editDialogVisible:false,
        //修改的表单数据对象
        editForm:{
          attr_name:''
        },
        //修改的表单校验规则对象
        editFormRules:{}
      }
    },
    created(){
      this.getCateList()
    },
    methods:{
      //获取商品分类别表
      async getCateList(){
        const {data:res} = await this.$http.get('categories')
        if(res.meta.status!==200) return this.$message.error('获取商品分类失败')
        this.cateList=res.data
        console.log(this.cateList)
      },
      //联级选择框选中项变化会触发这个函数
      async handleChange(){
      this.getParams()

      },
      //点击标签页切换
      handleTabClick(){
        this.getParams()
      },
      //获取参数
      async getParams(){
        //只能选择第三级
        if(this.selectedKeys.length!==3){
          this.selectedKeys=[]
          this.manyTableData=[]
          this.onlyTableData=[]
          return
        }
        const {data:res} =await this.$http.get(`categories/${this.cateId}/attributes`,{params:
            {sel:this.activeName}})
        console.log(res.data)
        //将获取到的attr_vals字符串转换成数组
        res.data.forEach(item=>{
          item.attr_vals=item.attr_vals?item.attr_vals.split(' '):[]
          //控制文本框的显示与隐藏
          item.inputVisible=false
          //文本框中输入的值
          item.inputValue=''
        })
        if(this.activeName==='many'){
          this.manyTableData=res.data
        }else{
          this.onlyTableData=res.data
        }
      },
      //关闭添加参数对话框
      addDialogClosed(){
        this.$refs.addFormRef.resetFields()
      },
      //添加参数
      addParams(){
        this.$refs.addFormRef.validate(async valid=>{
          if(!valid){
            return
          }

          const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{attr_name:this.addForm.attr_name,attr_sel:this.activeName})
          if(res.meta.status!==201){
            this.$message.error('添加参数失败！')
          }
          this.$message.success('添加参数成功！')
          this.getParams()
          this.addDialogVisible=false

        })
      },
      //修改参数对话框的显示
      async showEditDialog(attr_id){
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params:{attr_sel:this.activeName}})
        if(res.meta.status!==200){
          this.$message.error('修改参数失败！')
        }
        this.editForm=res.data
        this.editDialogVisible=true
      },
      //关闭修改参数对话框后充值内容
      editDialogClosed(){
        this.$refs.editFormRef.resetFields()
      },
      //点击按钮修改参数信息
       editParams(){
        //进行预校验
        this.$refs.editFormRef.validate(async valid=>{
          if(!valid) return
          const { data:res } =await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
            attr_name:this.editForm.attr_name,
            attr_sel:this.activeName
          })
          if(res.meta.status!==200) return  this.$message.error('修改参数失败！')
          this.$message.success('修改参数成功')
          this.getParams()
          this.editDialogVisible=false
        })
      },
      //根据id删除参数
      removeParams(attr_id){
        this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(async () => {
          const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
          if(res.meta.status!==200) return this.$message.error('删除失败')
          this.$message.success('删除参数成功')
          this.getParams()
          this.$message({
            type: 'success',
            message: '删除成功!'
          });
        }).catch(() => {
          this.$message({
            type: 'info',
            message: '已取消删除'
          });
        });

      },
      //按下enter或者失去焦点时触发
      async handleInputConfirm(row){
        //输入的是是空格的时候
        if(row.inputValue.trim().length===0){
          row.inputValue=''
          row.inputVisible=false
          return
        }
        //若果没有return，说明输入了内容，需要进行后续处理

        row.attr_vals.push(row.inputValue.trim())
        row.inputValue=''
        row.inputVisible=false
        this.saveAttrVals(row)

      },
      //发起网络请求,将操作保存到数据库中
      async saveAttrVals(row){
        //需要发起网络请求
        const {data:res} =await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
          attr_name:row.attr_name,
          attr_sel:row.attr_sel,
          attr_vals:row.attr_vals.join(' ')
        })
        if(res.meta.status!==200){
          return this.$message.error('修改参数项失败')
        }
        this.$message.success('修改参数项成功')
      },
      //点击按钮显示文本框
      showInput(row){
        row.inputVisible=true
        //$nextTick当页面上的元素被重新渲染后，才会调用回调函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        })
      },
      //点击关闭，删除对应参数项
      handelClosed(i,row){
        row.attr_vals.splice(i,1)
        this.saveAttrVals(row)
      }
    },
    computed:{
      //如果按钮需要被禁用，则返回true
      isBtnDisabled(){
        if(this.selectedKeys.length!==3){
          return true
        }
        return false
      },
      //当前选中的三级分类的id
      cateId(){
        if(this.selectedKeys.length===3){
          return this.selectedKeys[2]
        }
        return null
      },
      //标题名称
      titleText(){
          if(this.activeName==='many'){
            return '动态参数'
          }
          else{
            return '静态属性'
          }
      }

    }
  }
</script>

<style lang="less" scoped>
.cate_opt{
  margin: 15px 0;
}
  .el-tag{
    margin: 10px;
  }
  .input-new-tag{
    width: 120px;
  }
</style>
